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arXiv 0704.1122astro-ph
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EGRET Gamma-ray源能谱的扩展空气簇射实验研究

Investigation of Energy Spectrum of EGRET Gamma-ray Sources by an Extensive Air Shower Experiment

M. Khakian Ghomi, M. Bahmanabadi, F. Sheidaei, J. Samimi, A. Anvari

摘要:

超高能(UHE)($E>100 $ TeV)广泛的空气簇射(EAS)已被监测了五年(1997-2003年),在伊朗德黑兰使用闪烁探测器的小阵列。对数据进行了分析,以考虑到源计数对天顶角的依赖性。由于上覆大气厚度的变化,簇射计数率与天顶角有很大的关系。在一个日历年中,不同的源以不同的天顶角进入阵列的视场,并且具有不同的等效于一天中的天顶的有效观测时间。对EGRET第三目录中的高能伽马射线源进行了观测,并使用过量方法对数据进行了分析。获得了10个EGRET源的上限。然后,我们调查了EAS事件率为这10个源,并获得了一个流量为他们每个人使用我们的实验结果和模拟参数。最后,我们研究了γ射线光谱在UHE范围内使用这些通量与EGRET源的报告通量。

英文摘要:

Ultra-High-Energy (UHE) ($E>100 $TeV) Extensive Air Showers (EASs) have been monitored for a period of five years (1997-2003), using a small array of scintillation detectors in Tehran, Iran. The data have been analyzed to take in to account of the dependence of source counts on zenith angle. Because of varying thickness of the overlaying atmosphere, the shower count rate is extremely dependent on zenith angle. During a calendar year different sources come in the field of view of the array at varying zenith angles and have different effective observation time equivalent to zenith in a day. High energy gamma-ray sources from the EGRET third catalogue where observed and the data were analyzed using an excess method. Upper limits were obtained for 10 EGRET sources. Then we investigated the EAS event rates for these 10 sources and obtained a flux for each of them using parameters of our experiment results and simulations. Finally we investigated the gamma-ray spectrum in the UHE range using these fluxes with reported fluxes of the EGRET sources.

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